GB2025495A

GB2025495A - Reinforced earth structures

Info

Publication number: GB2025495A
Application number: GB7922297A
Authority: GB
Original assignee: ENSIO MIETTINEN Oy AB
Current assignee: ENSIO MIETTINEN Oy AB
Priority date: 1978-06-28
Filing date: 1979-06-27
Publication date: 1980-01-23
Also published as: NO150249C; IT1119013B; GB2025495B; NO792142L; DE2925955A1; SE7905196L; FI56240B; NO150249B; BE877299A; IT7968363A0; DK271979A; SE438173B; FR2438123A1; ATA437179A; US4280567A; IT7953363V0; FI56240C; AT363045B; FR2438123B3

Description

1

SPECIFICATION

Device for driving root supports of poles into the ground The present invention is concerned with a device for driving root supports of poles into the ground, said device comprising a weight producing the impact force, a guide for guid ing the movements of the weight, and means for producing movement of the weight back and forth, said means comprising at least one pulley fastened to the guide and a rope or similar passing over the pulley and, at one end, fastened to the weight, whereby the lower portion of the guide is provided with means for detachable mounting of the device onto the root support.

In all countries in which, after the Second World War, unimpregnated or poorly impreg- 85 nated wooden poles have been mounted the situation has been reached in which some of the poles have become rotten at the ground level so that they ought to be replaced or provided with reinforcing pole root supports reinforcing the rotten base of the pole.

The replacement of individual poles with interruptions in the power supply and with necessarily involved labour, machine, and ma terial expenses is so expensive for the electric ity and telephone companies that they attempt to support rotten poles until it is justified to reconstruct the entire power or telephone line.

Similar root supports have been driven into the ground so far mainly by means of two different methods.

In the U.S. Patent 3,033,297 a device used for this purpose is described, consisting of a U-section guide supported against the ground-inside which guide a device is mounted operated by a hydraulic motor for moving the weight vertically inside the guide.

The guide also surrounds the root support placed underneath the weight. Drawbacks of similar devices are their high weight, compli cated structure, and difficulty of installation.

Since the position of the root support in relation to the pole is precisely determined, the position of the guide in relation to the pole must also be correct in order that the weight should meet the root support in the desired way. The ground around poles is, however, often covered with stones and une ven, for which reason installation of a heavy guide in the desired position along the pole is 120 cumbersome, and mostly it is necessary to use cranes for that purpose, as is also sug gested in said U.S. Patent.

Another method is suggested in the U.S.

Patent 3,320,714. Therein an air hammer is mounted on special ladders leaning against the pole and provided with pulleys and, moreover, the hammer is fastened to the pole by means of chains surrounding the pole. As the pole reinforcement is being forced into the GB2025495A 1 ground, the position and location of the air hammer must be constantly adjusted by means of ropes in order that the hammer should all the time have full effect on the root support in the correct direction. This adjustment requires both complicated equipment and trained personnel.

It is a common feature of the devices described above that they are difficult to carry in rough terrain, and in farming areas they spoil the crops and result in high indemnities.

From the German Patent 731,841, another device is known for driving a pole into the ground, wherein a disk or anvil is fastened to the plane top face of the pole, and a guide is secured to a hole in the anvil disk for the weight. The weight is lifted up by means of ropes passing over symmetrically placed pulleys.

The object of the present invention is to eliminate the above drawbacks by means of an inexpensive and handy-to-carry device which causes a minimum of damages to land owners and which can be handled and oper- ated even by one man.

This goal is achieved so, according to the invention, that the installation means comprise a connecting part and two parallel projections placed on one side of this connecting part, the distance between said projections being approximately equal to the thickness of the reinforcing root support and said projections being positioned so that, when the device is installed, they are placed on different sides of the root support so as to secure the guide in a position substantially parallel to the root support and that each rope for lifting the weight has been arranged as running over a pulley so that it leaves the pulley in the direction of the pole. Owing to the arrangement in accordance with the invention, the guide keeps itself constantly in the correct position in relation to the root support thereby optimizing the impact effect of the weight.

This effect is produced, on one hand, by the construction of the installation means and, on the other hand, by the circumstance that each lifting rope leaves the pulley in the direction of the pole. Moreover, the guide and the weight follow the root support, without any particular operations when the support penetrates into the ground. Since the device in accordance with the invention does not require components by means of which it were supported against the ground or from which it would be hanging above the root support, it can be made very simple and of a very light weight and, consequently, also inexpensive and easy to carry. The preparatory work and the work proper do not require trained personnel.

Since, when the weight is being lifted, the pulling strain on the ropes is directed at the pole, the upper portion of the device does not have to be fastened to the pole, whereby only 2 GB2025495A 2 one fastening to the pole at the installation means placed at a level is sufficient.

The device in accordance with the present invention will be described more closely below with reference to the attached drawing, wherein Figure 1 shows the device in accordance with the invention as a side view as mounted in position, Figure 2 shows the device as viewed from 75 the front, and Figure 3 shows the device in the transport position.

Figs. 1 and 2 show a pole 3 decaying at 16 the ground level, which pole is, in the ground, surrounded by stones 1. In order to support the pole, the pole is surrounded at the rotten position by at least one root support 2, which is, e.g., a semicircular trough bent out of a metal sheet of 2 to 6 mm of thickness, the bending radius of said trough being approximately equal to the radius of the base of the pole. The length of a root support is, e.g., 1.2 to 1.8 metres, about one half of which re- mains above the ground level.

The device in accordance with the invention comprises a guide 8, which is a, e.g., circular or angular rod, and a weight 9, which surrounds the guide and is coaxial with same and which weight may move along the guide back and forth. In order to produce the movements of the weight, two ropes 10 have been fastened to its fastening brackets, which ropes pass over pulleys 11 fastened to the upper portion of the guide and which ropesextend down to the drive means or to the person performing the work. In view of simple installation of the device, it is essential that the ropes shall pass from the pulleys to the oppo- 4.0 site side of the pole, because the force effective in the ropes during the lifting of the weight then pulls the guide towards the pole, because of which the guide does not have to be fastened to the pole at the upper end of the guide.

The lower end of the guide is provided with installation means for detachable installation of the guide onto the root support. These installation means consist, in the embodiment shown, of a connecting part 7 functioning as the anvil and consisting of a substantially horizontal disk, and of parallel projections 4 and 6 fastened to the bottom face of the connecting part, whose distance from each other approximately equals the thickness of the root support. The installation means are placed at the top edge of the root support 2 so that the root support penetrates in between the projections 4, 6 and its upper edge rests against the connecting part 7. The projections secure the guide in a certain position in relation to the root support, preferably as parallel to same.

The position of the projection 6 between the pole and the root support is in the respect important that it keeps the upper part of the root support at a distance from the pole, the bottom edge of the root support being guided towards the pole 3 and being thereby pre- vented from tossing against stones 1 supporting the pole.

Moreover, the installation means are made such that they are supported against vertical edges of the root support or against recesses, projections or equivalent placed in the root support, so as to secure the device in position in the lateral direction of the root support.

A fastening means 5 of adjustable length, such as a chain, is fastened to the projection 4, said chain being placed around the pole so as to prevent the top portion of the root support 2 and the device in accordance with the invention from escaping from the pole. The chain may be provided with wheels, in which case it glides smoothly down the pole when the root support is being driven into the ground.

In view of movement on the road and in the terrain, the device may be provided with one or more wheels 13, as shown in Fig. 3, which wheels may preferably be instantly detachable.

One or several frames or platforms 14 may be fastened to the installation means, to the guide 8, or to the wheels 13 for carriage and storage of root supports 2 and/or tools, etc. required at work.

The installation means and/or the guide of the device may be additionally provided with a means 12 that can be fastened to the hook of a vehicle and/or used for pulling the device in the terrain.

The device in accordance with the invention operates as follows:

The device equipped as shown in Fig. 3 is pushed alongside the pole 3, a root support 2 is placed standing against the pole, and the device is lifted into its working position onto the root support 2, possibly by means of a particular installation means. When the fastening means 5 has been secured, the weight 9 is lifted to its upper position by pulling on the rope 10 and it is thereupon allowed to fall freely, whereby, when it hits against the anvil 7, it drives the root support into the ground.

This is continued until about one half of the root support has been driven into the ground, whereupon the fastening means 5 is detached and the device is lifted off the root support.

The drawing and the related specification are only intended to illustrate the idea of the invention. Thus, the number of the pulleys 11 placed at the top of the guide may vary from one to several and, if the weight 9 is particu- larly heavy, the pulleys may be replaced, e.g., by means of a winch in order to increase the transmission ratio.

Instead of fastening to the upper edge of the root support 2, the installation means may be fastened to the root support at a lower Q v 3_. 1 3 GB2025495A 3 position by means of notches, openings, projections or equivalent provided in the root support, in which case, when being installed, the device does not have to be raised equally high as in the embodiment in which the installation means are placed at the top edge of the root support. In this case, the guide may be placed either so that the weight hits straight against the top of the root support without the intermediate of the anvil or so that the weight falls beyond the top of the root support against the connecting part 7, whereby the impact force can be transmitted to the root support by means of the connect- ing part, of the guide, and/or by means of a separate pu, Iling rod. The guide may, of course, consist of several rods or equivalent.

In order to facilitate the installation work, the weight 9 is preferably detachable from the guide,- in which case the weight 9 can be lifted into its position separately, which is advantageous especially when the entire installation work is performed by one person.

Claims

1. A device for driving root supports of poles into the ground, said device comprising a weight (9) producing the impact force, a guide (8) for guiding the movements of the weight, and means for producing movement of the weight (9) back and forth, said means comprising at least one pulley (11) fastened to the guide and a rope (10) or similar passing over the pulley and, at one end, fastened to the weight (9), whereby the lower portion of the guide (8) is provided with means (4, 6, 7) for detachable mounting of the device onto the root support (2), characterized in that the installation means comprise a connecting part (7) and two parallel projections (4, 6) placed on one side of this connecting part, the distance between said projections being approximately equal to the thickness of the reinforcing root support (2) and said projections being positioned so that, when the device is installed, they are placed on different sides of the root support so as to secure the guide in a position substantially parallel to the root support and that each rope (10) for lifting the weight has been arranged as running over a pulley (11) so that it leaves the pulley in the direction of the pole (3).

2. A device as claimed in claim 1, characterized in that the installation means (4, 6, 7) may be fastened to the top of the root support (2) and/or to projections, holes, notches, or equivalent placed in the root support.

Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd.-1 980. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1 AY, from which copies may be obtained.